RU2551599C2 - Device for adjustment of inflow in production casing pipe - Google Patents

Device for adjustment of inflow in production casing pipe Download PDF

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Publication number
RU2551599C2
RU2551599C2 RU2012126669/03A RU2012126669A RU2551599C2 RU 2551599 C2 RU2551599 C2 RU 2551599C2 RU 2012126669/03 A RU2012126669/03 A RU 2012126669/03A RU 2012126669 A RU2012126669 A RU 2012126669A RU 2551599 C2 RU2551599 C2 RU 2551599C2
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RU
Russia
Prior art keywords
valve
casing
inflow
wall
device
Prior art date
Application number
RU2012126669/03A
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Russian (ru)
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RU2012126669A (en
Inventor
Йерген ХАЛЛУНБЕК
Пол ХЕЙЗЕЛ
Original Assignee
Веллтек А/С
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Publication date
Priority to EP09177927.2 priority Critical
Priority to EP20090177927 priority patent/EP2333235A1/en
Application filed by Веллтек А/С filed Critical Веллтек А/С
Priority to PCT/EP2010/068817 priority patent/WO2011067371A1/en
Publication of RU2012126669A publication Critical patent/RU2012126669A/en
Application granted granted Critical
Publication of RU2551599C2 publication Critical patent/RU2551599C2/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/06Valve arrangements for boreholes or wells in wells
    • E21B34/08Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121Lifting well fluids
    • E21B43/122Gas lift
    • E21B43/123Gas lift valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • F16K7/14Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
    • F16K7/17Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being actuated by fluid pressure

Abstract

FIELD: oil-and-gas industry.
SUBSTANCE: group of inventions relates to the system of regulation of inflow to a well providing regulation of inflow to liquid casing pipe, which inflows from outside of the casing pipe, for example, from productive formation or an intermediate casing pipe. The system contains the casing pipe with the axial direction and the wall thickness (t), the inflow control valve with the body containing a stop with the length pre-set by a longitudinal axis of the body, and a spring element, movable with reference to the body and thus controlling inflow of the liquid passing through the valve from the inlet opening of the body towards outlet opening of the body. The valve is located so that axial direction of the valve is perpendicular to axial direction of the casing pipe. The spring element is designed with a possibility of utilisation of elastic properties along the named axis of the valve and perpendicular to axial direction of the casing pipe, with generation of elastic force providing possibility of liquid flow control through the valve from the inlet opening towards the outlet opening of the body. The spring element is also designed with a possibility of operating as a diaphragm towards the named stop with providing of closure of the opening.
EFFECT: improvement of efficiency of control of liquid inflow from productive formation into the casing pipe.
15 cl, 10 dwg

Description

Technical field

The invention relates to a system for controlling inflow into a well, designed to control the flow of fluid into the casing coming from outside the casing, for example from a reservoir or an intermediate casing. The control system for inflow into the well contains an casing with an axial direction, a wall of a certain thickness, an inflow control valve having a body with a length specified by the longitudinal axis of the body, and a spring element that is movable relative to the body and thereby regulates the flow of fluid passing through the valve from the inlet housing openings to the housing outlet.

State of the art

In an oil or gas production well, fluid from the reservoir to the casing usually flows into the casing directly from the rock, in particular when the well is pumped by an open bottom hole, or through perforations in the wall of the casing. Recently, slotted filters, sliding sleeves or strainers have been proposed that provide a simple path for fluid flow into the casing.

These decisions are usually based on the flow that occurs when creating a working pressure drop between the reservoir and the borehole.

Recently, devices have been installed inside the borehole that provide the ability to control the differential pressure through a fixed-diaphragm diaphragm type valve. As the pressure applied to the fixed diaphragm increases, the flow rate through the valve increases. Such systems are commonly referred to as passive flow control devices (ICDs).

Recently, valves have been proposed by which the pressure drop is varied by means of surface regulation using hydraulic piping or electric lines, and by means of said regulation, by adjusting the diaphragm, the pressure difference applied to the valve is varied with the flow rate through the valve.

Due to the complex nature of the fluid flow path from the reservoir to the surface of the well and the repeated change of fluid flow regimes, preliminary calculation of the pressure drop between the reservoir and the borehole presents significant difficulties for production wells. Therefore, preliminary calculation of the size of the valve diaphragm to be installed and preliminary calculation of the optimal control of valves from the surface are difficult, which impedes the efficient operation of the field. In addition, as the well progresses, heterogeneities in the reservoir and changing conditions in the well cause pressure fluctuations between the reservoir and the borehole.

Description of the invention

The aim of the invention is the full or partial overcoming of the above disadvantages and flaws inherent in the prior art. In particular, the goal is to create an alternative inflow control valve that facilitates the regulation of fluid flow from the reservoir to the casing.

The solution of the above problems, together with a number of other tasks, as well as advantages and features that are described in more detail in the description below, are provided according to the invention by means of a well inflow control system designed to control fluid flow into the casing outside the casing, for example, from reservoir or from an intermediate casing containing:

- casing with an axial direction and a wall having a certain thickness,

- an inflow control valve having a housing with a length defined by the longitudinal axis of the housing, and a spring element movable relative to the housing and thereby regulating the flow of fluid passing through the valve from the housing inlet to the housing outlet,

in which the valve is positioned so that the axial direction of the valve is perpendicular to the axial direction of the casing.

An inflow control valve having an axial direction perpendicular to the axial direction of the casing allows the valve to be inserted from the inside of the casing after the well is completed. During the extraction of hydrocarbons or oil, the reservoir moves with the rise of oil, after which it is necessary to introduce inflow control valves that provide the necessary movement of the inflow channel. Valves according to the prior art are usually introduced during the completion of the well, and if there is a movement of the oil reservoir, the location of the valves is no longer correct, therefore only oil, not water, can enter the casing. The valve according to the invention can be introduced at a later stage, when the oil reservoir moves.

In one embodiment, the length of the valve body is substantially equal to or less than the wall thickness of the casing.

Additionally, the spring element exhibits its elastic properties in the axial direction of the valve, perpendicular to the axial direction of the casing, with the creation of elastic force.

In addition, it is possible that the inlet of the casing extends from the outer surface of the casing to the inner surface of the casing in the radial direction of the casing, providing the possibility of imparting fluid to the radial direction.

In another embodiment, the control system for inflow into the well further comprises a sleeve located opposite the valve and configured to slide from an open position to a closed position.

The location of the sliding sleeve opposite the valve as part of the wall of the casing allows the sliding sleeve to be closed when the casing is under pressure from the inside in order to perform a specific operation that requires the use of high-pressure fluid, for example, when expanding the annular bridges . At the end of this work, requiring the use of high pressure, it is planned to open the sliding sleeve with the possibility of fluid flowing from the annular space into the casing through the valve.

Additionally, the sleeve is slidably mounted back and forth in a recess in the casing wall and forms part of the wall thickness.

Due to this, a decrease in the inner diameter of the casing is excluded, which could limit the implementation of subsequent work in the well.

The control system of the inflow into the well, as an option, contains a device for placing the valve in the casing, and the specified device contains:

- a milling head, made with the possibility of elongation in the radial direction of the specified device, designed to make holes in the wall of the casing,

- a device, for example a milling cutter, a tap, a cutting device or a thread-cutting device, designed to make a mounting recess or thread in the hole,

- and a device for input, for example a guide pusher designed to enter the valve into the hole.

Additionally, the control system of the inflow into the well, as an option, contains a device for extracting the valve into the wall of the casing, and the specified device contains:

- a key designed to enter the recess in the valve,

- and a rotary device connected to the key, designed to rotate the valve to unscrew the valve or to disengage the valve mounting device in order to remove the valve.

The invention also relates to a downhole inflow control valve configured to enter a casing pipe into a wall of a well completion, said valve optionally comprising:

- housing with a given longitudinal axis,

- and a spring element that exhibits its elastic properties along the axial direction of the valve and perpendicular to the axial direction of the casing, with the creation of an elastic force that enables the regulation of fluid flow through the valve from the inlet to the outlet of the housing.

The downhole flow control valve, optionally, further comprises:

- a piston element mounted with the possibility of sliding inside the housing and containing an end surface and at least one side surface adjacent to the housing and extending from the end surface in the direction of the outlet of the housing, the end surface facing the inlet and having a piston opening for leakage fluid from the inlet through the piston hole and out through the outlet,

- and a spring element located between the housing and the piston,

in which the lateral surface of the piston element is configured to at least partially close the outlet opening to ensure a decrease in fluid flow into the casing.

Due to the presence of an inflow control valve according to the invention, a very simple design and, consequently, ease of manufacture of the valve are provided. In addition, this provides the possibility that failure of a smaller number of elements will occur when using the valve in the well. The valve design does not have long and narrow fluid flow paths that can cause particles to become stuck and block the fluid flow path.

In one embodiment, the housing has a first, second, and third wall, the second wall being located between the first and third wall, and the inlet is located in the first wall, and the outlet is located in the second wall.

In another embodiment, the piston element is a spring-loaded element, for example a spring-loaded diaphragm, mounted in the housing and springy up and down in its center to move the side surface of the piston element in order to reduce the outlet. In this embodiment, a spring element is not required.

In addition, as an option, the housing has a shape similar to a hollow cylinder, the piston has a shape similar to a hollow cylinder without a lower base, and the end surface of the piston is round. In another embodiment, the side surface of the piston has an opening located opposite the outlet of the housing and allowing fluid to flow out of the housing and into the casing, and in the event of pressure loss in the reservoir or foreign particles blocking the inlet, the spring element allows the piston to move in the direction of the inlet with closing the outlet.

Additionally, the side surface of the piston from its outer side between the bore and the end farthest from the surface of the piston is optionally provided with a spike or protrusion entering the outlet, thereby preventing the piston from moving down again.

In yet another embodiment, the fluid in the reservoir is under the first pressure, the fluid after passing through the inlet is at a second pressure, the fluid after passing through the piston orifice is under a third pressure, and the fluid after passing through the outlet is under fourth pressure and when the second pressure is higher than the third pressure and the pressure of the elastic force of the spring element, it is possible to push the piston with a second pressure so that it is at least partially closed outlet.

The housing, as an option, contains a cavity in which the piston is slidably mounted, and said piston divides the housing into a first cavity part and a second cavity part.

In addition, the valve, as an option, contains a group of outlet openings, which, in particular, are located in the same wall of the housing. Additionally, the housing, as an option, has a square shape and several second walls.

The spring element, as an option, contains a coil spring, a disk spring, a leaf spring or a rubber element.

The piston element, as an option, has a lower surface, and the spring element, as an option, is located between the lower surface and the housing.

The downhole inflow control valve, optionally, further comprises at least one sealing device between the piston and the housing, the sealing device being attached on the outside of the piston or on the inside of the housing wall.

In addition, it is possible that the housing has an abutment and a spring element operating as a diaphragm in the direction of the abutment, ensuring that the hole is closed.

Additionally, the diaphragm, as an option, contains at least one valve hole.

The downhole flow control valve, as an option, further comprises a membrane located between the abutment and the spring element.

The downhole flow control valve, as an option, further comprises a bellows having a bellows hole, while the housing has a protrusion tapering into the body, and the specified bellows hole is located around the protrusion so that when the bellows is expanded, the liquid is not able to enter through the bellows the hole, and when not expanded, the liquid is allowed to pass through the bellows hole and out through the valve outlet.

The downhole flow control valve, as an option, further comprises a mounting device for attaching the valve to the hole in the casing.

The fastening device, as an option, contains a thread or the fastening device, as an option, contains a group of protrusions protruding outward into the groove in the hole in the wall of the casing and forming, for example, a bayonet lock.

Additionally, the downhole flow control valve, as an option, contains a unique identifier, such as a chemical or radioactive label.

In addition, the valve, optionally, contains a gas sensor, a water sensor or a density sensor, configured to close the valve when the density value is lower or higher than the specified density value. In one embodiment, the gas or water sensor or the density sensor comprises a closure device for closing the outlet or inlet.

Each valve, as an option, contains a unique identifier, for example a chemical identifier.

The closure of the sensor, as an option, contains a swellable material that closes when swelling the inlet, outlet or hole in the surface of the piston when the liquid contains an excess of water or gas.

In addition, as an option, the sensor contains capable of dissolving material, which, as an option, contains a unique identifier that is released when the specified material is dissolved.

Additionally, the valve, as an option, contains a filter or strainer. This filter, as an option, contains a unique identifier or is covered by a unique identifier, such as a chemical or radioactive label.

In addition, the valve, as an option, contains a chamber filled with a unique identifier.

This unique identifier, as an option, is a hydrophilic identifier, the release of which occurs when the liquid contains water.

In addition, it is possible to open a chamber filled with a unique identifier using a gas or water sensor.

In a further embodiment, the casing is an operational casing surrounded by an intermediate casing, and in which the fluid is gas pumped into the intermediate casing and into the valves of the operational casing.

The invention also relates to a method for installing a downhole flow control valve into an existing well casing, the casing having a casing wall, said method comprising the steps of:

- entering the device into the casing and lowering the device to a predetermined position,

- providing a hole in the wall of the casing,

- the input of the downhole flow control valve into the hole,

- and attaching the downhole flow control valve to the casing wall.

The hole, as an option, is provided with a fastening device, for example, a thread, which makes it possible to attach the valve to the wall of the casing by screwing the valve into the wall of the casing, or with a mechanical lock adapted to interact with the lock located on the valve.

In addition, the invention relates to a method for replacing a downhole flow control valve in a casing of a well, the casing having a wall of the casing, said method comprising the steps of:

- entering the device into the casing and lowering the device to the valve to be replaced,

- detaching the valve from the wall of the casing,

- removing the valve from the casing and thereby opening a hole in the wall of the casing,

- introducing a new valve into the hole,

- and attaching a new valve to the casing wall.

Additionally, the invention relates to a method for determining the position of a particular downhole inflow control valve during operation in a group of inflow control valves spaced from each other in the wall of the well casing, in which each valve contains a unique identifier, the method comprising the steps of:

- fluid analysis for unique identifiers,

- comparison of the result of the analysis of the liquid with a unique identifier for each valve,

- and determining a specific valve based on the results of the comparison. Finally, the invention relates to a device in which this device for extracting a valve into a casing wall comprises:

- a milling head for making holes in the wall of the casing,

- a device for performing a mounting recess or thread in the hole,

- and an input device designed to enter the valve into the hole,

- either a wrench designed to be inserted into a recess in the valve and to unscrew the valve, or to disengage the valve fixture to remove the valve.

The casing of the system, as an option, contains a strainer that allows fluid to flow through the strainer to enter the inflow control valve.

In an additional embodiment, the system sleeve is located inside or in connection with the casing opposite the valve outlet, allowing the sleeve to close the valve outlet.

In addition, the system, as an option, contains a control device designed to control the closing of each valve from the surface.

Additionally, the system, as an option, contains a device for analyzing the liquid for the presence of unique identifiers.

Additionally, the invention relates to a method for installing a downhole flow control valve in a casing.

Thanks to the concept of the invention, the possibility of improvement is provided, which is the introduction of downhole flow control valves into existing wells.

The hole is preferably made by milling or drilling.

In addition, it is possible to close the valve outlet after attaching the valve to the casing wall. Closing the valve outlet can be accomplished by pushing or pushing the piston element or the spring element of the valve to close the outlet.

In addition, it is possible to close the valve outlet after attaching a new valve to the casing wall. Closing the valve outlet can be accomplished by pushing or pushing the piston element of the valve to close the outlet.

Brief Description of the Drawings

The invention and a number of its advantages are described in more detail below with reference.

to the attached drawings, on which conditionally, for illustrative purpose,

a number of non-limiting implementations are presented.

Figure 1 - system for regulating the inflow into the well,

Figure 2 - the proposed valve-regulator inflow, a view in section,

Figure 3 is another embodiment of a flow control valve,

Figure 4 is another embodiment of a flow control valve,

5 is another embodiment of a flow control valve,

6 is another embodiment of a flow control valve,

7 is another embodiment of a flow control valve,

Fig - the proposed system for regulating the inflow into the well,

Fig.9 is another embodiment of an inflow control system,

Figure 10 is another embodiment of an inflow control system.

All the images shown are conditional and executed without strict observance of the scale, and display only those sections that are necessary in order to explain the invention, while other sections are omitted and only implied.

Detailed Disclosure of Invention

Figure 1 illustrates an inflow control system 100 to a well 100 comprising a casing 4 in a borehole and a group of inflow control valves for controlling the flow of fluid 2 from the reservoir into the casing 4. The casing 4 has an axial direction 28 and a wall having a thickness t. Each inflow control valve 1 has a length 30 specified by the longitudinal axis 29 of the valve body, and each valve is positioned so that the axial direction of the valve is perpendicular to the axial direction of the casing. When the axial direction of the flow control valve is perpendicular to the axial direction of the casing, it is possible to introduce the valve from the inside of the casing after completion of the well. Valves according to the prior art are usually introduced during the completion of the well, and if there is a movement of the oil reservoir, the location of the valves is no longer correct and the valves should be closed so that, in particular, water is blocked from access to the casing.

The valve according to the invention can easily be introduced in the next step when the oil reservoir is moving.

Casing 4 is most often an operational casing, which in the area closest to the surface is surrounded by a second intermediate casing 18 and which, in the area closest to the depth, is located directly in the reservoir 3. The control valve 1 of the inflow is located in casing 4 for regulating the flow of fluid 2 from the intermediate casing 18 or reservoir 3, when it enters the casing 4.

The downhole flow control valve 1 comprises a body 5 having an inlet 6 and an outlet 7. As shown in FIG. 2, the body 5 is housed in the wall of the casing by means of a threaded connection 13. The length of the valve body 30 is substantially equal to or less than the thickness of the casing wall pipes.

Inside the housing 5 there is a piston element 8 mounted for sliding back and forth to narrow the outlet of the housing 5. The piston element 8 has an end surface 9 facing the inlet 6 of the housing 5. The piston element 8 further comprises a side surface 10 adjacent to the inner the surface of the housing 5 and passing from the surface 9 in the direction of the outlet 7 of the housing 5. The end surface 9 has a piston hole 11 that allows the flow of fluid 2 from the inlet 6 Through the piston hole 11 and out through the outlet 7 of the housing 5. The valve 1 further comprises a spring element 12 located between the housing 5 and the piston 8, in which the side surface 10 of the piston element 8 is configured to at least partially close the outlet 7 reduce the flow of fluid 2 into the casing 4 and, therefore, reduce the flow rate of the fluid.

Due to the presence of the piston element 8, movable inside the valve body 5, a self-acting valve 1 is provided with a very simple design, capable of regulating the flow of fluid. This simple design facilitates the manufacture of the valve, and in addition, provides the possibility that there will be a failure of a smaller number of elements after the introduction of valve 1 into the well. To enter the flow control valve 1 into the well, the valve must be easy to install, which is not particularly ensured if the valve openings must be aligned with existing openings. It is possible to easily install the inflow control valve 1 into an existing casing 4 by milling holes with a threaded connection 13 in the casing, as a result of which the valve can be installed without additional alignment.

The housing 5 has a first 14, second 15 and third 16 wall, and the second wall 15 is located between the first 14 and third wall 16, ensuring that the first 14 and second wall 15 are not adjacent to each other. The inlet 6 is located in the first wall 14 of the housing 5, and the outlet 7 is located in the adjacent second wall 15. The spring element 12 is located inside the piston 8 and presses on the end surface 9 of the piston 8 in the direction of the inlet 6 from the outlet 7.

2, the housing has a shape similar to a hollow cylinder, and the piston 8 has a shape similar to a hollow cylinder without a lower base. The end surface 9 of the piston 8 is therefore circular, and the side surface 10 of the piston 8 is a cylindrical side surface extending from the surface 9 towards the third wall 16 of the housing 5 and the outlet 7. In another embodiment, the housing 5 has a square section, which means that the housing 5 has four second walls 15 between the first 14 and the third wall 16.

5, the side surface 10 of the piston 8 is also a cylindrical side surface having two holes located outside and aligned with the outlet 7 of the housing 5, allowing fluid 2 to flow outside the housing by breaking the casing 4. If the outlet 7 needs to be narrowed, the side surface 10 of the piston 8 is offset from the inlet 6 in the housing 5. This embodiment has the advantage that if the pressure in the reservoir 3 is reduced due to blockage of the inlet 6 particles, or if the filter or strainer is blocked, the spring element 12 moves the piston 8 in the direction of the inlet 6, whereby the outlet 7 is closed.

On the outside of the side surface 10 of the piston 8, between the hole and the end farthest from the surface of the piston 9, the side surface 10 of the piston 8 is provided with a spike or protrusion entering the outlet 7, as a result of which the piston 8 can not be moved down again. The spike or protrusion is held inside the wall of the side surface of the piston 10 and, if possible, it rotates outward in the direction of exit from the hole. Thus, the inflow control valve 1 is constantly closed, which makes it possible to place a new valve in another place in the casing wall or to replace the valve. If the valve is not closed, and the flow blocking element has been removed over time, then the valve begins to pass the flow of fluid 2 into the casing 4 again. This is an undesirable situation, since it excludes the possibility of optimal operation control.

The fluid 2 in the reservoir 3 or in the intermediate casing 18 has a first pressure, the fluid 2 after the passage of the inlet 6 has a second pressure, the fluid 2 after the passage of the piston orifice has a third pressure, and the fluid 2 after the passage of the outlet 7 has a fourth pressure. When the second pressure is higher than the third pressure and the elastic force pressure of the spring element 12, it is possible to push the piston 8 by a second pressure so as to at least partially close the outlet 7. Thus, the valve is able to control the flow of fluid into the casing.

As shown in FIGS. 2-5, the housing 5 comprises a cavity in which the piston 8 is slidably mounted. The piston 8 divides the housing 5 into two parts, the first cavity part and the second cavity part, which still remain one cavity.

The liquid 2 in the reservoir 3 or the intermediate casing 18 has a first pressure P1f, the liquid 2 in the first cavity part after the passage of the inlet 6 has a second pressure P 2 , the liquid 2 after the passage of the piston hole in the second cavity part has a third pressure P 3 , and the liquid 2 after passing the outlet 7 has a fourth pressure P 4 . When the second pressure is higher than the third pressure and the elastic force pressure F of the spring element, the piston 8 is allowed to be pushed out by the second pressure to ensure at least partial closure of the outlet 7.

In figure 2, the control valve 1 of the inflow contains two outlet openings 7. In another embodiment, it, as an option, contains more outlet openings 7.

2-4, the spring element 12 is depicted as a coil spring. In Fig. 5, the spring element 12 is a disc spring consisting of layerwise placed discs. The spring element 12 is made in the form of a spring fixture of any suitable type, for example a leaf spring or rubber.

In Fig. 2, the inflow control valve 1 is attached to the casing by means of a thread, but other fixing devices 13 are also possible, for example, a group of protrusions entering a groove in the wall of the casing. Alternatively, the mounting device 13 is a bayonet lock. In Fig. 3, the valve has a fastening device 13 in the form of protrusions acting like spikes when they enter a groove in the wall of the casing. The control valve 1 of the inflow, as an option, has the shape of a tapering cone installed in a conical hole in the wall of the casing. To fix the valve when it is inserted into the casing 4, the valve is provided with a fastening device 13 in the form of spring-loaded levers 13, with their release when the tip of the valve enters the outer part of the casing 4, as shown in Fig.5. Thus, from the inside of the well, it is easy to introduce an inflow control valve into existing wells.

The piston element 8 is slidably mounted inside the housing 5, and in order to force the fluid to pass only through the piston hole 11, it is possible to accommodate the sealing device 22 between the piston side surface 10 and the second wall 15 of the housing 5. It is possible that the sealing device 22 is attached in a cylindrical groove in the piston 8, as shown in FIG. 2, or in a cylindrical groove of the housing wall, as shown in FIG. 3. The sealing device 22, as an option, is made in the form of a sealing ring or any other suitable sealing device 22.

The inflow control valve 1 contains a filter 17 preventing solid elements from entering liquid 2 through the inlet 6 of the valve. The filter 17 is therefore located in the opening in the housing 5, where it is connected to the housing 5 by means of a threaded connection 13. As shown in FIG. .3, the strainer 20 is alternatively located on the outside of the casing 4, forcing the fluid 2 to pass through the strainer 20 before entering the inlet 6. In FIG. 3, the piston element 8 comprises a bottom surface attached to the surface 1 by means of plates, pins or similar elongated elements, and the spring element 12 is located between the lower surface and the housing 5. It is possible to make the piston element 8 in the form of a hollow cylinder or other hollow element having, for example, a square section, as shown in FIG. 5. The spring element 12 can be positioned between the third wall 16 of the housing 5 and the lower surface of the piston element 21. On the outside of the piston 8, the side surface 10, as an option, also has spikes or protrusion that restrains the elastic force, which leads to the protrusion entering the output hole 7 and thereby closes it.

The inflow control valve 1 contains a water sensor that closes the valve when the fluid 2 flowing from the reservoir 3 contains an excess of water. Similarly, the inflow control valve 1 comprises a gas sensor that closes the valve when the fluid flowing from the reservoir 3 contains an excess amount of gas. It is possible that the valve includes a density sensor that detects changes in the density of liquid 2 and provides the ability to close the valve if the density is lower or higher than the specified density value.

The valve contains a closing device, making it possible to close it when the liquid 2 has an excessively high water or gas content or when the density changes excessively.

It is also possible to close the valve by central control from the surface or by means of a device 101 inserted into the casing 4. Due to the ability to control the water and / or gas content and close the valve when the limit values are reached, it is much easier to maintain a high quality of operation.

If the piston element 8 is a hollow element, as shown in FIG. 5, and has spikes or protrusions on the outside, the closing procedure can be performed by drilling a hole in the bottom surface of the inflow control valve 1 and then pushing the piston 8 until the protrusions will not turn into outlet openings 7 and thereby will not close the valve.

6 illustrates another embodiment of an inflow control valve, in which the length of the valve body 30 is less than the wall thickness of the casing due to the fact that the sliding sleeve 26 is located in the recess 27. The sliding sleeve 26 is shown in its closed position, preventing the penetration of fluid flow from the valve to the casing, but also preventing leakage of fluid in the casing through the flow control valve. The sliding couplings 26 are located opposite the valves and are slidable from the open to the closed position so that the couplings slide back and forth in the recesses 27 in the casing wall and these couplings form part of the wall thickness.

With a sliding sleeve 26 opposite the valve as part of the casing wall, it is possible to close the sliding sleeve 26 when the casing 4 is pressurized from the inside so as to perform a certain operation requiring the use of a high-pressure fluid, for example when the expansion of the annular jumpers is performed.

At the end of the operation requiring the use of high pressure, it is envisaged to open the sliding sleeve 26 with the possibility of fluid flow from the annular space into the casing through the valve.

Due to the presence of a sleeve sliding in the recess in the casing, the inner diameter of the casing does not decrease, which is preferable since a decrease in the diameter of the casing may limit subsequent operations in the well.

In addition, in this embodiment, the spring element exhibits its elastic properties in the axial direction of the valve perpendicular to the axial direction of the casing, with the creation of elastic force. The housing has an emphasis 35, a membrane 31 and a spring element that acts as a diaphragm in the direction of the specified emphasis with the provision of closing valve openings 36 in the valve. The spring element comprises two star-shaped spring plates located one on top of the other with offset relative to each other so that holes are formed between the ends of these star-shaped plates. When pressurized fluid from the reservoir flows through a strainer 20 into the inlet, this fluid causes the star plates 12A, 12B to move downward in the direction of said stop and diaphragm 31, minimizing passage through these openings. The membrane 31 in its center has an opening through which the liquid passes before entering the outlet 7 and after passing through these openings.

Another embodiment of a flow control valve 1 is shown in FIG. 7. The valve comprises a strainer 20 located in the inlet 6 of the housing 5, and a spring element 12 in the form of a bellows. The housing 5 has a protrusion 37, tapering from the end of the housing 5 containing the outlet 7, in the direction of the inlet 6. The bellows has a valve hole 36, into which the protrusion enters so that when fluid flows through the valve inlet 6 from the reservoir, the pressure the liquid causes the expansion of the bellows, resulting in a movement of the valve opening 36 in the direction of the outlet openings 7, and the valve opening 36 decreases with the movement of the bellows due to the fact that the protrusion reduces to a cone and fills Part of the valve hole 36. Thus, the high pressure caused by the fluid pressure in the reservoir, the valve opening decreases, and thus regulates the inflow of fluid. When the pressure in the reservoir is reduced, the bellows is compressed again and the valve hole 36 passes more fluid.

Thus, the inlet of the valve body extends from the outer surface 32 of the housing 5 to the inner surface 33 of the housing 5 in the radial direction 34 of the casing 4, making it possible to impart a radial direction to the fluid. Moreover, the length 30 of the valve body is substantially equal to or less than the wall thickness of the casing 102.

The closure of the sensor, as an option, contains a swellable material located in the inlet 6 or in another hole through which the liquid 2 flows, resulting in a swelling of said swellable material if the liquid 2 contains an excess of water or gas. The sensor, as an option, contains capable of dissolution of the material containing a unique identifier released during the dissolution of the specified material. It is possible that the dissolvable material is a plastic material containing an identifier.

A gas or water sensor or density sensor, optionally, contains a unique identifier, such as a chemical or radioactive label, released upon reaching a predetermined limit value. In another embodiment, the filter 17 comprises a unique identifier and / or is covered by a unique identifier. In yet another embodiment, the valve comprises a chamber filled with a unique identifier. Thus, it is possible for each valve to release a unique identifier identifying this particular valve in order to determine which valve should be closed based on control tasks and optimal operation.

The unique identifier, in particular, is a hydrophilic identifier, the release of which occurs when liquid 2 contains water. A camera filled with a unique identifier can be opened using a gas or water sensor.

FIG. 8 illustrates a well inflow control system 100 for controlling fluid flow 2 into a casing 4 outside the casing 4, for example from a reservoir 37 or from an intermediate casing 38. The well system 100 includes a casing 4 having a casing wall and a group of control valves 1 inflow spaced from each other in the wall of the casing, as shown in Fig. As illustrated further in FIG. 8, there is a group of valves 1a, 1b, 1c, 1d, 1e, and 1f. These valves differ in that each of them has a unique identifier.

The control valve 1 of the inflow of the system 100, in particular, is the valve mentioned above.

The control system of the inflow into the well 100, as an option, contains a strainer 20, due to which the liquid 2 passes through the strainer 20 before entering the inflow control valve 1. Thus, the deceleration of the fluid 1 occurs, and the penetration of large solid elements into the valve is prevented. On the inside of the casing 4 outside the outlet 7, the system, as an option, has a sleeve configured to close the valve outlet 7.

As shown in the system of FIG. 9, casing 4 is a production casing that is surrounded by an intermediate casing 18, and in which liquid 2 is gas pumped into the intermediate casing 18 and into the valves of the production casing. Packers 19 are located between the production casing and the intermediate casing 18. Instead of using an artificial lifting device, gas is injected, which, as a result, enters the space between the intermediate casing 18 and the production casing, and also into the production casing through the control valves 1 inflow. Thus, the gas is pumped into the liquid 2 in the form of bubbles that lift the liquid 2.

The control valve 1 of the inflow of the system 100, as an option, contains a chamber filled with a unique chemical identifier.

In addition, the system 100, as an option, contains a control device designed to control the closing of each valve from the surface. The system 100 may also include a device 101 inserted into the casing 4 in order to close the valve outlet openings 7.

It is possible that the control valves 1 of the inflow of the system 100 are introduced into existing wells with the possibility of replacing the valves if they work in an unsatisfactory manner. To enter the valve, the system 100 comprises a device 101 having a milling head for making an opening in the casing wall 102, a device for making a mounting recess or thread in the hole 103, and an input device 104 for introducing the valve into the specified hole.

When the system 100 is used to replace the valve, it includes a device 101 for removing the valve from the casing wall and containing a key 105 for insertion into the recess in the valve and for unscrewing the valve, or for disengaging the valve attachment 13 to remove the valve. In addition, the system comprises an insertion device 104 for introducing a valve into an opening.

Similarly, when replacing the downhole flow control valve in the casing of the well, the casing having a casing wall, the device is inserted into the casing and lowered to the valve to be replaced. The valve is then detached from the wall of the casing and removed from the casing, resulting in a hole in the wall of the casing. After that, a new valve is introduced into the hole and attached to the wall of the casing.

In order to determine any of the identifiers identified by one or more valves, the system contains a device for analyzing the liquid for the presence of unique identifiers.

Therefore, if during operation it is necessary to determine the position of a particular inflow control valve 1 among several inflow control valves 1 spaced from each other in the wall of the casing of the well, each valve having a chamber filled with a unique identifier, then a liquid is analyzed for unique identifiers. After that, the result of the analysis of the liquid is compared with the unique identifier of each valve, and the result of this comparison serves as the basis for determining a particular valve.

In addition, existing wells according to the invention can be equipped with downhole flow control valves 1 by modifying them. This is possible due to the following steps: introducing the device 101 into the casing 4 and lowering the device 101 to a predetermined position, ensuring the presence of an opening in the wall of the casing, introducing the downhole valve-regulator 1 of the inflow into the hole and attaching the downhole valve-regulator 1 of the inflow to the wall casing pipe.

By fluid 2 or well fluid is meant any type of fluid that may be present in oil or gas wells, for example, natural gas, oil, drilling mud, crude oil, water and similar fluids. Gas is understood to mean any type of gas mixture present in the well, either finished or open, and oil is understood to be any type of oil mixture, for example, crude oil, oily liquid, and the like. Therefore, all gas, oil and water liquids contain other elements or substances other than gas, oil and / or water, respectively. It is possible that the liquid is also a combination of gas, oil, water and small solid particles in the liquid.

Casing 4 means all types of pipes, turbines, pipe products and similar equipment used in wells for oil or natural gas production.

In the event that the device cannot be immersed to the full depth in the casing 4, a downhole tractor is designed to push the devices all the way to the desired position in the well. A downhole tractor is any type of drive unit configured to push or pull devices in a well, such as Well Tractor®.

Although the invention has been described with reference to preferred embodiments of the invention, it will be apparent to those skilled in the art that a number of modifications are possible within the scope of patent protection of the invention, limited by the claims below.

Claims (15)

1. The system (100) for regulating the inflow into the well, ensuring the regulation of the inflow into the casing of the liquid (2) coming from the outside of the casing (4), for example from a reservoir (37) or an intermediate casing (38), containing:
- casing pipe (4) with an axial direction (28) and a wall (39) having a thickness (t),
- an inflow control valve (1) having a housing containing an abutment (35) with a length (30) defined by the longitudinal axis (29) of the housing and a spring element (12, 12A, 12 V) movable relative to the housing and thereby regulating the flow of fluid passing through the valve from the inlet (6) of the housing to the outlet (7) of the housing,
in which the valve is located in such a way that the axial direction of the valve is perpendicular to the axial direction of the casing, and the spring element (12) is configured to manifest its elastic properties in the direction of the specified axis of the valve and perpendicular to the axial direction of the casing, with the creation of an elastic force that allows adjustment the fluid flow through the valve from the inlet (6) to the outlet (7) of the housing, while the spring element is configured to operate as a diaphragm in the direction SRI said abutment secured hole closing.
2. The system for controlling inflow into a well according to claim 1, in which the spring element (12) comprises two spring plates (12A, 12B).
3. The system for controlling inflow into a well according to claim 2, in which the spring plates are made in the shape of a star and are located one on top of the other so that holes are formed between the ends of the said plates made in the form of a star.
4. The system for controlling inflow into a well according to claim 3, wherein the length (30) of the valve body is substantially equal to or less than the wall thickness of the casing.
5. The system for controlling inflow into the well according to any one of paragraphs. 1-4, in which the inlet of the housing extends from the outer surface (32) of the housing to the inner surface (33) of the housing in the radial direction (34) of the casing, making it possible to impart fluid to the radial direction.
6. The system for controlling inflow into the well according to any one of paragraphs. 1-4, further containing a sleeve (26) located opposite the valve and made with the possibility of sliding from an open position to a closed position.
7. The system for controlling the inflow into the well according to claim 6, in which the coupling is mounted to slide back and forth in the recess (27) in the wall of the casing and forms part of the wall thickness.
8. The system for controlling inflow into the well according to any one of paragraphs. 1-4 or 7, containing a device (101) for accommodating a valve in a casing, said device comprising:
- a milling head, made with the possibility of elongation in the radial direction of the specified device, designed to make holes in the wall (102) of the casing,
- a cutting device for making a mounting recess or thread in the hole (103), and
- a fixture (104) for input, for example, a guide pusher designed to enter the valve into the hole.
9. A system for controlling inflow into a well according to any one of paragraphs. 1-4 or 7, in which the casing of the system contains a strainer that allows fluid to flow through the strainer to enter the inflow control valve.
10. A system for controlling inflow into a well according to any one of paragraphs. 1-4 or 7, and this system contains a regulatory device designed to regulate the closing of the valve from the surface.
11. A system for controlling inflow into a well according to any one of paragraphs. 1-4 or 7, in which the diaphragm of the valve contains at least one valve hole (36).
12. A method of installing a downhole flow control valve for an inflow control system in a well according to any one of paragraphs. 1-11 into an existing well casing, wherein the casing has a casing wall, said method comprising the steps of:
- entering the device into the casing and lowering the device to a predetermined position,
- providing a hole in the wall of the casing,
- input of the downhole flow control valve into the hole, and
- attaching the downhole flow control valve to the casing wall.
13. The method according to p. 12, further containing a stage on which the hole is provided with a fastening device, for example, a thread, which allows the valve to be attached to the casing wall by screwing the valve into the casing wall, or a mechanical lock configured to interact with the lock located on the valve.
14. A method for replacing a downhole flow control valve for an inflow control system according to any one of claims. 1-11 in the well casing, wherein the casing has a casing wall, the method comprising the steps of:
- entering the device into the casing and lowering the device to the valve to be replaced,
- detaching the valve from the wall of the casing,
- removing the valve from the casing and thereby opening a hole in the wall of the casing,
- introducing a new valve into the hole, and
- attaching a new valve to the casing wall.
15. A device for extracting a valve of a control system for inflow into a well according to any one of paragraphs. 1-11, and the device for extracting the valve from the wall of the casing contains:
- a milling head for making holes in the wall (102) of the casing,
- a device for performing a mounting recess or thread in the hole (103), and
- an input device (104) for introducing the valve into the hole, or
- a wrench (105) intended for insertion into a recess in the valve and for unscrewing the valve, or for disengaging the valve mounting device in order to remove the valve.
RU2012126669/03A 2009-12-03 2010-12-03 Device for adjustment of inflow in production casing pipe RU2551599C2 (en)

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EP20090177927 EP2333235A1 (en) 2009-12-03 2009-12-03 Inflow control in a production casing
PCT/EP2010/068817 WO2011067371A1 (en) 2009-12-03 2010-12-03 Inflow control in a production casing

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BR112012013009A2 (en) 2016-11-22
EP2507472A1 (en) 2012-10-10
EP2333235A1 (en) 2011-06-15
WO2011067371A1 (en) 2011-06-09
DK201170426A (en) 2011-08-03
CA2782717A1 (en) 2011-06-09
US9353607B2 (en) 2016-05-31
US20120305243A1 (en) 2012-12-06
CN102639811A (en) 2012-08-15
RU2012126669A (en) 2014-01-20
CN102639811B (en) 2015-09-30
DK201170425A (en) 2011-08-03

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Effective date: 20171204